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United States Patent | 5,589,966 |
Hama ,   et al. | December 31, 1996 |
The liquid crystal light modulation device of the present invention comprising a liquid crystal element consisting of one of plural liquid crystal cells and a voltage signal input means electrically connected with the liquid crystal element, wherein each liquid crystal cell contains a chiral smectic liquid crystal material layer and when a voltage signal is input to the liquid crystal element, the polarization direction of a light transmitted by the liquid crystal element is changed by approx. 90.degree. as compared with the state where the voltage signal is not input to the liquid crystal element enables a change of a light path and an open-close (on-off) operation of a light path at a high speed (optical switching time: not longer than 1 msec).
Inventors: | Hama; Hideo (Sodegaura, JP); Sakai; Yukari (Sodegaura, JP) |
Assignee: | Mitsui Petrochemical Industries, Ltd. (Tokyo, JP) |
Appl. No.: | 237120 |
Filed: | May 3, 1994 |
May 11, 1993[JP] | 5-109512 |
Current U.S. Class: | 349/174; 349/96; 349/117; 349/196 |
Intern'l Class: | G02F 001/141; G02F 001/134.7 |
Field of Search: | 359/53,93,63,65,73,100,36,37,39 |
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5168381 | Dec., 1992 | Walba | 359/53. |
5347378 | Sep., 1994 | Handschy et al. | 359/53. |
5367391 | Nov., 1994 | Johno et al. | 359/56. |
5381253 | Jan., 1995 | Sharp et al. | 359/53. |
5392142 | Feb., 1995 | Mitsutake et al. | 359/73. |
Foreign Patent Documents | |||
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